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If R={(1,1),(1,2),(2,2)}, which pair is required from (1,2) and (2,2) in a transitive check?

Answer and explanation

Correct answer: (1,2)

For transitivity, use the pattern (a,b) and (b,c), then require (a,c). Here the first given pair is (1,2), so a=1 and b=2. The second pair is (2,2), so b=2 and c=2. Matching the common middle component is the key step. Therefore the required conclusion is (a,c)=(1,2), which is option A. That pair is already present in R, so this particular chain satisfies the transitive requirement. Option B reverses the ordered pair, while options C and D do not use the first and last components of the chain in the required way. This checks one implication; a complete proof would inspect every applicable chain.

Related tags

RelationsTransitive RelationRelation CheckingRelations And FunctionsMathematicsClass 12 Mcq

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